用C#实现图片数据库存储与显示
在网络上查找了一些资料，对C#实现图片的数据库存储与显示作个总结！所有代码都可以直接复制运行。准备数据库，在SQL2000数据库的pubs数据库中建立一个ImageStore数据表，字段有ImgID,ImageData,ImageContentType,ImageDescription,ImageSize五个字段。
Let's go......
1.图片文件的存储，代码如下：(processImage.aspx)
<% 
@ Page language="c#" Codebehind="imageProcess.aspx.cs" AutoEventWireup="false" Inherits="imageProcess.imageProcess" %>
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
< HTML >
< HEAD >
< title > imageProcess </ title >
< meta name ="GENERATOR" Content ="Microsoft Visual Studio .NET 7.1" >
< meta name ="CODE_LANGUAGE" Content ="C#" >
< meta name ="vs_defaultClientScript" content ="JavaScript" >
< meta name ="vs_targetSchema" content ="http://schemas.microsoft.com/intellisense/ie5" >
</ HEAD >
< body MS_POSITIONING ="GridLayout" >
< form id ="Form1" method ="post" runat ="server" >
< FONT face ="宋体" >< INPUT style ="Z-INDEX: 101; LEFT: 48px; POSITION: absolute; TOP: 32px" type ="file" name ="File1"
id ="File1" runat ="server" >
< asp:TextBox id ="txtDescript" style ="Z-INDEX: 102; LEFT: 48px; POSITION: absolute; TOP: 72px"
runat ="server" TextMode ="MultiLine" Width ="224px" Height ="64px" ></ asp:TextBox >
< asp:Button id ="btnUpload" style ="Z-INDEX: 103; LEFT: 216px; POSITION: absolute; TOP: 152px"
runat ="server" Text ="上传" Width ="56px" ></ asp:Button ></ FONT >
< asp:DataGrid ID ="DG_Persons" AutoGenerateColumns ="False" Width ="632px" HeaderStyle-BackColor ="#ff0000"
HeaderStyle-Font-Bold ="True" HeaderStyle-ForeColor ="#ffffff" ItemStyle-BackColor ="Beige" BorderColor ="Black"
Runat ="server" HeaderStyle-HorizontalAlign ="Center" style ="Z-INDEX: 105; LEFT: 48px; POSITION: absolute; TOP: 208px" >
< ItemStyle BackColor ="Beige" ></ ItemStyle >
< HeaderStyle Font-Bold ="True" HorizontalAlign ="Center" ForeColor ="White" BackColor ="Red" ></ HeaderStyle >
< Columns >
< asp:TemplateColumn HeaderText ="图片编号" >
< ItemTemplate >
< asp:Label id =Label1 Text ='<%# DataBinder.Eval(Container.DataItem, "ImgID") % > ' Runat="server">
</ asp:Label >
</ ItemTemplate >
</ asp:TemplateColumn >
< asp:TemplateColumn HeaderText ="图片类型" >
< ItemTemplate >
< asp:Label Runat ="server" Text ='<%# DataBinder.Eval(Container.DataItem, "ImageContentType") % > ' ID="Label2"/>
</ ItemTemplate >
</ asp:TemplateColumn >
< asp:TemplateColumn HeaderText ="图片大小" >
< ItemTemplate >
< asp:Label Runat ="server" Text ='<%# DataBinder.Eval(Container.DataItem, "ImageSize") % > ' ID="Label3"/>
</ ItemTemplate >
</ asp:TemplateColumn >
< asp:TemplateColumn HeaderText ="照片" >
< ItemTemplate >
< asp:Image Runat =server ID ="Image2" ImageUrl ='<%# FormatURL(DataBinder.Eval(Container.DataItem, "ImgID")) % > ' />
</ ItemTemplate >
</ asp:TemplateColumn >
</ Columns >
</ asp:DataGrid >
</ form >
</ body >
</ HTML >
2.相应的后台代码processImage.aspx.cs代码如下：
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.IO;
namespace imageProcess
{
/**//// <summary>
/// imageProcess 的摘要说明。
/// </summary>
public class imageProcess : System.Web.UI.Page
{
protected System.Web.UI.WebControls.TextBox txtDescript;
protected System.Web.UI.HtmlControls.HtmlInputFile File1;
protected System.Web.UI.WebControls.DataGrid DG_Persons;
protected System.Web.UI.WebControls.Button btnUpload;
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
dataGridBind();
}
private void dataGridBind()
{
SqlConnection con=new SqlConnection("server=.;database=pubs;uid=sa;pwd=;");
con.Open();
SqlCommand cmd=new SqlCommand("select ImgID,ImageContentType,ImageSize,ImageData from ImageStore",con);
this.DG_Persons.DataSource=cmd.ExecuteReader();
this.DG_Persons.DataBind();
con.Close();
}
Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/**//// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.btnUpload.Click += new System.EventHandler(this.btnUpload_Click);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
private void btnUpload_Click(object sender, System.EventArgs e)
{
SqlConnection con=new SqlConnection("server=.;database=pubs;uid=sa;pwd=;");
con.Open();
FileStream fs=File.Open(this.File1.PostedFile.FileName,FileMode.Open);
byte[] by=new byte[fs.Length];
fs.Read(by,0,(int)fs.Length);
String SqlCmd = "insert into ImageStore(ImageData,ImageContentType,ImageDescription,ImageSize) values(@Image,@fileType,@fileDec,@fileSize)";
SqlCommand CmdObj = new SqlCommand(SqlCmd, con);
CmdObj.Parameters.Add("@Image",SqlDbType.Image, (int)fs.Length).Value = by;
CmdObj.Parameters.Add("@fileType",SqlDbType.VarChar,20).Value=this.File1.PostedFile.ContentType;
CmdObj.Parameters.Add("@fileDec",SqlDbType.VarChar,200).Value=this.txtDescript.Text;
CmdObj.Parameters.Add("@fileSize",SqlDbType.BigInt).Value=this.File1.PostedFile.ContentLength;
fs.Close();
CmdObj.ExecuteNonQuery();
dataGridBind();
}
protected string FormatURL(object strArgument)
{
return "ReadImage.aspx?id=" + strArgument.ToString();
}
}
}
3.从数据库中读取图片
新建一个readImage.aspx窗体文件，输入C#代码（readImage.aspx.cs）如下：
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.IO;
namespace imageProcess
{
/**//// <summary>
/// ReadImage 的摘要说明。
/// </summary>
public class ReadImage : System.Web.UI.Page
{
private void Page_Load(object sender, System.EventArgs e)
{
string strImageID = Request.QueryString["id"];
SqlConnection myConnection = new SqlConnection("server=.;database=pubs;uid=sa;pwd=;");
SqlCommand myCommand = new SqlCommand("Select ImageContentType, ImageData from ImageStore Where ImgID="
+ strImageID, myConnection);
try
{
myConnection.Open();
SqlDataReader myDataReader;
myDataReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);
if(myDataReader.Read())
{
Response.Clear();
Response.ContentType = myDataReader["ImageContentType"].ToString();
Response.BinaryWrite((byte[])myDataReader["ImageData"]);
}
myConnection.Close();
}
catch (SqlException SQLexc)
{
Response.Write("提取数据时出现错误：" + SQLexc.ToString());
}
Response.End();
}
Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/**//// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}
以上代码部分是应用自网络，与大家共同分享，谢谢！
